Process of brazing.



Patented December 13, 1904i.

PATENT LEIGH ROY SCHAAP, OF LOVELAND, COLORADO, ASSIGNOR TO THE NA- TIONAL BRAZING COMPOUND COMPANY, OF DENVER, COLORADO.

PROCESS OF BRAZING.

SPECIFICATION forming part of Letters Patent No. 777,546, dated December 13, 1904.

Original application filed April 18, 1904, Serial No. 203,7 L5. Divided and this application filed J 11110 3, 1904;. Serial No. 210,983.

(No model.) i

To (all whom it may concern.-

Be it known that I, LEIGH ROY SCI-IAA1 ,L citizen of the United States, residing at Loveland, in the county of Larimer and State of Colo- 5 rado, have invented a certain new and useful Process of Brazing; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable oth ers skilled in the art to which it appertains to I make and use the same.

This invention relates to a process for brazing; and the invention is adapted for use in brazing those metals--such as cast-iron, aluminium, and copper-which heretofore have been found diliicult or impossible to braze by the use of ordinary brazing methods. This process includes the treating of the parts to be united by the use of prussiate oi potash. The yellow prussiate of potash is preferred.

2 Either of the prussiates of potash, however, may be successfully employed. Whenever the term prussiate of potash is hereinafter employed, it must be considered to include both the red and yellow species. These ingredi- 5 cuts are commonly known by the name specified. However, the term potassium ferrocyanid is a more technical term for the yellow prussiate of potash and potassium ferricyanid for the red prussiate of potash.

3 The more common terms, however, will be used in this specification. The process fur ther embraces the completion of the brazing act by the use of other elements, such as plas ter-of-paris and charcoal, to prevent the prussiate oi potash from spreading, citric acid for the purpose of cleansing the parts to be united, and the use of borax, the use of the last-named element being old in the brazing art.

The subject-matter of this application is di 4 vidcd out of an application filed by me April 18, 1904, Serial No. 203,745.

In carrying out my improved process it is preferred to apply the prussiate of potash, together with the charcoal, plaster-of-paris,

and citric acid, first, and, finally, the borax, though all of these elements may be applied at the same time, if desired.

In practicing the process the parts to be united are placed in suitable proximity to each or as close together as practicable. They are 5 then raised to a brazing heat by the use of gas-burners or by the application of heat in any other suitable manner. The prussiate of potash is then applied to the joint to be brazed or to the line of division between the two parts to be united. At the same time and in combination therewith the plaster-oi paris, wood-charcoal, and citric acid, it used, are also applied, though good results may be obtained by the use of the prussiate of pot' 6O ash alone. The boraX then used. Good results are obtained by using these elements in the following proportions: prussiate oif' potash, two ounces; plaster-otparis, two

ounces; wood-charcoal, one-half ounce; citric 5' acid, one ounce; borax or boracic acid, two ounces.

It must be understood that I do not limit the invention to the use of precise proportions, since 1' am aware that they may be con- 7 siderably or even greatly varied without departing from the spirit of the invention.

The subject-matter of this application is de scribed in my application liled April 18,1904, and hereinbeiore referred to; but the claims forminga partof this application are not made in the said original application.

Having thus described my invention, what I claim is 1. The herein-described process iorpropar- 8O ing metals for brazing, consisting in raising the parts to be united to a suitable tempera ture, applying prussiate of potash, plasterol -paris, wood-charcoal and citric acid, to the parts to be united, and finally applying borax, 5 substantially as described.

52. A process of brazing consisting in raising the parts to be united to a suitable tem perature, and. applying prussiate of potash, plaster-ofiparie, charcoal, citric acid and bo- 9 rax thereto in suitable proportions and finally applying the brazing metal, substantially as described.

3. The herein-described process for preparing metals for brazing, consisting in raising the parts to be united to a suitable temperature, applying yellow prussiate of potash, finally applying the brazing metal, substan- I0 plaste1'-ofparis,wood-charcoal and citric acid, tially as described.

to the parts to be united, and finally applying In testimony whereof I affix my signature in borax, substantially as described. presence of two witnesses. 5 4. A process of brazing consisting in rais- LEIGH ROY SOHAAP ing the parts to be united to a suitable temperature, and applying yellow prussiate of \Vitnesses:

potash, plaster-of-paris, charcoal, citric acid DENA NELSON, and borax thereto in suitable proportions and A. J. OBRI N. 

